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Objective: It is in vitro study to evaluate the influence of various mouth washes on cusp deflection of premolar teeth restored with different types of composite. Methods: A total of 45 human premolars were used in this study. The teeth were randomly divided into three equal groups according to the type of resin composite (Silorane, Bulk fill and FiltekTM Z250). Each group were immersed for three months in three different solutions (alcoholcontaining mouth rinse, alcohol-free mouth rinse, and artificial Saliva). The cuspal deflection was measured after curing of the composite resin and after immersion in the solution using digital caliper. Results: All the composite resin specimens show cusp deflection. The lowest value of cusp deflection was recorded for the Silorane specimen in comparison to other types of composites. The specimens who immersed in alcohol containing mouth wash recorded the highest values. Conclusion: Alcohol-free mouth rinse may prefer to alcohol containing mouth rinse in patients with extensive restorations (494) Hossam Mohamed Mossa E.D.J. Vol. 64, No. 1 a dentifrice may be justified, especially in cariesactive patients [6, 7]. If the composite resin restorative materials bathed in saliva the water absorption will occur .The factors which affect the amount of water absorption of the composite restoration materials are filler content, curing time, the resin content, distance from composite cured and the coupling agent [8–10]. When the filler content of the composite is more the water absorption will be less [8, 11]. The proper the bonding of the coupling agent the lesser the water absorption [12,13]. For resin-based composite materials water absorption may induce weakening of the matrix followed by breakdown of resin filler interface. It is also expected the hygroscopic expansion of composite that result from absorption of water may be able to compensate for the effect of polymerization shrinkage and relieve stresses [14]. The organic matrix of conventional resin composites is generally based on methacrylate chemistry, especially cross linking dimethacrylate. The solubility of dimethacrylate based resin composites in various solutions including water and mouth rinses has been widely studied [15, 16–18].

Effect of different types of water on cusp deflection of teeth restored with composite